A system for measuring the sedimentation stability of a drilling fluid

Abstract

The utility model discloses a system for measuring well drilling fluid sedimentation stability, include: main control device, it is used to generate temperature control information and pressure control information, and obtains the test rod downlink resistance, temperature control device and pressure control device, wherein, temperature control / pressure control device is used to provide analog temperature / pressure environment to experimental drilling fluid according to temperature control / pressure control information, testing device has the test cup and test rod for containing experimental drilling fluid, is used for controlling test rod downlink movement to the bottom target position of experimental drilling fluid, and real -time acquisition test rod downlink resistance. The utility model discloses through recording test rod downlink resistance to evaluate the sedimentation characteristic of well drilling fluid system, so that the test result is more accurate, and can set temperature, pressure and high temperature heating time through the instruction that main control device sent, realized the sedimentation characteristic of well drilling fluid under high temperature and high pressure condition to carry out long -term test.

Description

Technical Field

[0001] This utility model relates to the field of drilling fluid performance testing technology, and in particular to a system for measuring the settling stability of drilling fluid. Background Technology

[0002] Deep oil and gas resources are a crucial strategic area for my country's oil and gas development, and their safe and efficient development is essential for ensuring national energy security. With the development of deep oil and gas resources, the high-temperature and high-pressure environment downhole places higher demands on drilling fluids. To balance formation pressure, weighting agents such as barite are generally used to increase the weight of the drilling fluid system. Due to the addition of a large amount of weighting materials, the settling stability of high-density drilling fluids is a key indicator for evaluating drilling fluid performance. Therefore, it is necessary to accurately test the settling stability of the drilling fluid system under simulated high-temperature and high-pressure conditions at the bottom of the well.

[0003] Currently, the main methods for evaluating drilling fluid settling stability include static settling test, static stratification index method, VST settling test, and improved VST settling test.

[0004] Furthermore, an existing patent document (publication number CN118067572A) discloses a drilling fluid settling stability testing device and method. This scheme incorporates heating equipment to simulate a high-temperature environment and simulates the density values ​​of drilling fluid before and after settling under laminar and turbulent flow conditions. However, this scheme does not simulate the downhole high-pressure environment, and judging settling characteristics solely based on density values ​​will lead to inaccurate results.

[0005] An existing patent document (publication number CN108732064A) discloses a high-temperature, high-density drilling fluid settling stability testing device and method. This method also characterizes the settling stability of the drilling fluid system by density change, which cannot accurately reflect the stability of the drilling fluid system, and it involves pressure relief issues that prevent continuous measurement.

[0006] An apparatus for testing the settling stability of drilling fluid is disclosed in an existing patent document (publication number CN111380779A). This apparatus also characterizes the settling stability of the drilling fluid system by density change, which cannot accurately reflect the stability of the drilling fluid system, and it cannot achieve continuous measurement due to the pressure relief problem.

[0007] An existing patent document (publication number CN209055525U) discloses a drilling fluid settling stability testing device. This device cannot simulate the high temperature and high pressure environment downhole, and judging the settling characteristics solely by density value will result in inaccurate judgment results.

[0008] A drilling fluid settling stability testing system is disclosed in an existing patent document (publication number CN112986074A). However, this system determines the settling characteristics solely based on density values, which can lead to inaccurate results.

[0009] An existing patent document (publication number CN211122412U) discloses a dynamic measurement and evaluation device for the settling stability of drilling fluid under high temperature and high pressure conditions. However, the device determines the settling characteristics solely based on density values, which may lead to inaccurate judgment results.

[0010] An existing patent document (publication number CN118362471A) discloses a drilling fluid settling stability testing device, evaluation method, and application. This device calculates the settling coefficient of the drilling fluid by testing the density of the drilling fluid at different depths in an aged sample cup. However, this device does not achieve the testing of drilling fluid settling stability under high temperature and high pressure conditions, and it cannot achieve continuous measurement.

[0011] Therefore, through analysis of the above-mentioned techniques for measuring drilling fluid settling stability, existing studies only involve analyzing drilling fluid settling stability through density, which can easily lead to inaccurate judgment results and cannot achieve continuous measurement. Utility Model Content

[0012] The purpose of this invention is to provide a method for analyzing the settling characteristics of drilling fluid by simulating the high temperature and high pressure environment downhole and testing parameters different from density, thereby solving the problem that the existing technology of analyzing the settling characteristics of drilling fluid by relying solely on density is prone to inaccurate analysis results.

[0013] To address the aforementioned technical problems, this utility model provides a system for measuring the settling stability of drilling fluid, comprising: a main control device for generating temperature control information and pressure control information, and obtaining the downward resistance of a test rod; a temperature control device and a pressure control device, wherein the temperature control / pressure control device is used to provide a simulated temperature / pressure environment to the experimental drilling fluid based on the temperature control / pressure control information; and a testing device comprising a test cup for holding the experimental drilling fluid and a test rod, wherein the testing device is used to control the downward movement of the test rod to the bottom target position of the experimental drilling fluid, and to collect the downward resistance of the test rod in real time.

[0014] Preferably, the temperature control information includes the target experimental temperature and the experimental temperature holding time, wherein the temperature control device includes: a heating jacket with a groove embedded in its top for accommodating the test cup; a first temperature controller connected to the heating jacket; a second temperature controller connected to the internal space of the test cup; and a temperature control and measurement module connected to the two temperature controllers.

[0015] Preferably, the testing device includes: a support; a test platform horizontally mounted on the support; a test rod, the top end of which is fixedly connected to the bottom surface of the test platform and arranged vertically; a pressure sensor connected to the main control device for measuring the dynamic pressure at the top end of the test rod; a test cup disposed below the bottom of the test rod; and a transmission unit for controlling the lifting and lowering of the test platform to immerse the bottom of the test rod into the experimental drilling fluid or to pull the test rod out of the experimental drilling fluid.

[0016] Preferably, the testing device further includes a conduction chamber disposed on the top surface of the heating jacket and covering the mouth of the test cup, wherein a pressure balancing chamber is constructed in the middle of the conduction chamber, and the test rod passes through the pressure balancing chamber.

[0017] Preferably, the side wall of the conduction chamber is provided with a lateral through hole, which is used to connect the pressure balancing chamber with the external space.

[0018] Preferably, multi-level sealing rings are constructed at different positions along the axial direction of the conduction chamber to ensure the isolation of the pressure balance chamber from the external space and the experimental drilling fluid.

[0019] Preferably, the pressure control device includes: a pressurizing device connected to the lateral through hole for pressurizing the pressure balance chamber; and a pressure control and measurement module connected to the pressurizing device.

[0020] Preferably, the support frame has an L-shaped structure, wherein the transmission unit is located inside the vertical frame, the test bench is connected to the side wall of the vertical frame via a track set along the vertical frame, and the heating sleeve is set on the horizontal frame.

[0021] Preferably, the test rod is made of plexiglass.

[0022] Preferably, the transmission unit includes: a motor and its control unit assembly, which is used to respond to test commands or reset commands issued by the main control device; a slide rail; a ball screw disposed on the slide rail, wherein the ball screw is connected to the output shaft of the motor; and a slider disposed on the slide rail, wherein the slider is fixedly connected to the test bench.

[0023] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects: This invention proposes a system for measuring the settling stability of drilling fluids. The system evaluates the settling stability of the drilling fluid system by recording the downward resistance of the test rod. Its core function is to test the stability of the colloidal structure of the drilling fluid, making it more accurate than the density difference method. Furthermore, by using a main control device to change the target experimental temperature, the holding time at that temperature, and the target experimental pressure, long-term testing of the settling stability of the drilling fluid under high temperature and high pressure conditions can be achieved.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used in conjunction with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a system for measuring the settling stability of drilling fluid according to an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the specific structure of a system for measuring the settling stability of drilling fluid according to an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the test device in a system for measuring the settling stability of drilling fluid according to an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the transmission unit in a system for measuring the settling stability of drilling fluid according to an embodiment of this application. Detailed Implementation

[0029] The following detailed description of the embodiments of this utility model, in conjunction with the accompanying drawings, will provide a thorough understanding of how this utility model uses technical means to solve technical problems and achieve technical effects, enabling its implementation. It should be noted that, provided there is no conflict, the various embodiments and features within them can be combined with each other, and all resulting technical solutions are within the protection scope of this utility model.

[0030] Furthermore, the steps illustrated in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than that shown here.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0032] Currently, the main methods for evaluating drilling fluid settling stability include static settling test, static stratification index method, VST settling test, and improved VST settling test.

[0033] Furthermore, existing patent document (publication number CN118067572A) discloses a drilling fluid settling stability testing device and method, which incorporates heating equipment to simulate a high-temperature environment and simulates the density values ​​of drilling fluid before and after settling under laminar and turbulent flow conditions. Existing patent document (publication number CN108732064A) discloses a high-temperature, high-density drilling fluid settling stability testing device and method, which characterizes the settling stability of the drilling fluid system through density changes. Existing patent document (publication number CN111380779A) discloses a drilling fluid settling stability testing device, which characterizes the settling stability of the drilling fluid system through density changes.

[0034] A drilling fluid settling stability testing device is disclosed in existing patent document (publication number CN209055525U). However, this device relies solely on density values ​​to determine settling characteristics, leading to inaccurate results. A drilling fluid settling stability testing system is disclosed in existing patent document (publication number CN112986074A), which also determines settling characteristics solely based on density values. A dynamic measurement and evaluation device for drilling fluid settling stability under high temperature and high pressure conditions is disclosed in existing patent document (publication number CN211122412U), which determines settling characteristics solely based on density values. A drilling fluid settling stability testing device, evaluation method, and application are disclosed in existing patent document (publication number CN118362471A). This device calculates the settling coefficient of the drilling fluid by testing the density of drilling fluid at different depths in an aged sample cup.

[0035] Therefore, through analysis of the above-mentioned techniques for measuring drilling fluid settling stability, existing studies only involve analyzing drilling fluid settling stability through density, which can easily lead to inaccurate judgment results and cannot achieve continuous measurement.

[0036] Figure 1This is a structural diagram of the system for measuring the settling stability of drilling fluid according to an embodiment of this application. Figure 2 This is a schematic diagram of the specific structure of a system for measuring the settling stability of drilling fluid according to an embodiment of this application. The following is in conjunction with... Figure 1 and Figure 2 The specific structure of the system for measuring the settling stability of drilling fluid (hereinafter referred to as the "stability measurement system") described in the embodiments of this utility model will be explained.

[0037] refer to Figure 1 The stability measurement system includes: a main control device A, a temperature control device B, a pressure control device C, and a testing device D. The testing device D includes a test cup 1 and a test rod 2.

[0038] The main control unit A is configured to generate temperature control information and pressure control information, and to determine the downward resistance of the test rod.

[0039] Temperature control device B is configured to provide a simulated temperature environment to the experimental drilling fluid based on temperature control information. Pressure control device C is configured to provide a simulated pressure environment to the experimental drilling fluid based on pressure control information.

[0040] The test cup 1 is configured to hold the experimental drilling fluid. The test device D is configured to control the test rod 2 to move to the target position at the bottom of the experimental drilling fluid and to collect the downward resistance of the test rod in real time.

[0041] In this embodiment, the downward resistance of the test rod used for analysis by the main control device A is fed back by the test device D after the test begins.

[0042] In this embodiment, the temperature control information includes: the target experimental temperature and the duration of temperature holding. Optionally, the target experimental temperature is preferably in the range of 25℃ to 200℃.

[0043] In this embodiment, the pressure control information includes the target test pressure. Optionally, the target test pressure ranges from 0.1 to 10 MPa.

[0044] In this embodiment, the test rod 2 is made of plexiglass.

[0045] Optionally, the main control device A can be connected to the temperature control device B, the pressure control device C, and the testing device D via wired or wireless means.

[0046] In one embodiment, reference Figure 2 The temperature control device B includes: a heating jacket 3, a first temperature controller 4, a second temperature controller 5, and a temperature control and measurement module. Among these, combined with... Figure 2 and Figure 3(a) The top of the heating jacket 3 has a recessed groove for accommodating the test cup 1. The first temperature controller 4 is connected to the heating jacket 3. The second temperature controller 5 is connected to the internal space of the test cup. The temperature control and measurement module is connected to both temperature controllers.

[0047] The internal structure of the groove matches the external structure of test cup 1.

[0048] The second temperature controller 4 is configured to adjust the dynamic temperature of the drilling fluid used in the experiment.

[0049] The temperature control and measurement module is connected to the first temperature controller 4 and the second temperature controller 5, respectively. The temperature control and measurement module is configured to control the heating experiment to meet the required holding time after the corresponding heating object reaches the target experimental temperature, based on the temperature control information.

[0050] Specifically, in order to ensure the heating effect, the heating sleeve 3 is fixed to the high-temperature and high-pressure stainless steel cavity of the test cup 1.

[0051] In one embodiment, the testing device D includes: a support 6, a test platform 7 horizontally mounted on the support 6, a test rod 2, a pressure sensor 8, a test cup 1, and a transmission unit. (Refer to...) Figure 3 (a) The test cup 1 is positioned below the bottom of the test rod 2. The pressure sensor 8 is connected to the main control device A.

[0052] Continue to refer to Figure 3 (a) The support 6 has an L-shaped structure, the transmission unit is located inside the vertical frame, the test platform 7 is connected to the side wall of the vertical frame along the track set on the vertical frame, and the heating sleeve 3 is set on the horizontal frame.

[0053] The top of test rod 2 is connected to the bottom surface of the test platform and is set in a vertical direction.

[0054] Pressure sensor 8 is configured to measure the dynamic pressure at the tip of the test rod.

[0055] The transmission unit is configured to control the lifting and lowering of the test platform 7 to immerse the bottom of the test rod 2 into the experimental drilling fluid or to pull the test rod 2 out of the experimental drilling fluid.

[0056] Further, refer to Figure 4 The transmission unit includes: a motor and its control unit assembly 9, a slide rail 10, a ball screw 11 mounted on the slide rail 10, and a slider 12. The ball screw 11 is connected to the output shaft of the motor. The slider 12 is fixedly connected to the test bench 7.

[0057] The motor and its control unit assembly 9 are configured to respond to test commands or reset commands issued by the main control device A. Specifically, the motor and its control unit assembly 9 are configured to control the test platform 7 to descend in response to test commands issued by the main control device A to immerse the bottom of the test rod 2 into the experimental drilling fluid, and to control the test platform 7 to rise in response to reset commands issued by the main control device A to pull the test rod 2 out of the experimental drilling fluid.

[0058] Specifically, the ball screw 11 is connected to the output shaft of the motor so that the rotation of the motor output shaft drives the rotation of the ball screw 11, and then the rotation of the ball screw 11 drives the slider 12 to move on the slide rail 10, thereby realizing the control of the lifting and lowering of the test platform.

[0059] In one embodiment, reference Figure 3 (b) The testing device D also includes a conduction chamber. The conduction chamber is disposed on the top surface of the heating jacket 3 and covers the mouth of the test cup 1.

[0060] The transmission chamber has a pressure balancing chamber 14 in its central part. Specifically, the test rod passes through the pressure balancing chamber 14.

[0061] Furthermore, a lateral through-hole 15 is provided on the side wall of the transmission chamber. The lateral through-hole 15 is used to connect the pressure balancing chamber 14 with the external space.

[0062] Further reference Figure 3 (b) The test device D also includes: multi-level sealing rings constructed at different positions along the axial direction of the conduction chamber.

[0063] The multi-level sealing ring configuration is used to ensure the isolation of the pressure balance chamber 14 from the external space and the drilling fluid used in the experiment.

[0064] Specifically, a conduction chamber is provided on the top surface of the heating jacket 3 and at the mouth of the test cup 1, and a pressure balance chamber is constructed in the middle of the conduction chamber. Multi-level sealing rings are constructed at different positions along the axial direction of the conduction chamber. The multi-level sealing rings can also ensure that the test rod 2 moves down in a straight line in the experimental drilling fluid.

[0065] In one embodiment, the pressure control device C includes a pressurizing device and a pressure control and measurement module. The pressurizing device is connected to the lateral through-hole 15. The pressure control and measurement module is connected to the pressurizing device.

[0066] The pressurization equipment is configured to pressurize the pressure balance chamber 14.

[0067] The pressure control and measurement module is configured to control the pressure inside the pressure balance chamber to achieve the target test pressure based on the pressure control information.

[0068] Specifically, a lateral through-hole 15 is provided on the side wall of the conduction chamber. Simulated pressure is provided by a pressurizing device. When high pressure is required, the pressurizing device injects pressure into the pressure balance chamber through the lateral through-hole 15. Pressurization is stopped when the target experimental pressure is reached. When the test is over, the pressure is released through the lateral through-hole 15.

[0069] This invention proposes a system for measuring the settling stability of drilling fluids. The system evaluates the settling stability of the drilling fluid system by recording the downward resistance of the test rod. Its core function is to test the stability of the colloidal structure of the drilling fluid, making it more accurate than the density difference method. Furthermore, by using a main control device to change the target experimental temperature, the holding time at that temperature, and the target experimental pressure, long-term testing of the settling stability of the drilling fluid under high temperature and high pressure conditions can be achieved.

[0070] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

[0071] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0072] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0074] The phrase "an embodiment" or "an embodiment" used in this specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0075] Although the embodiments disclosed in this utility model are as described above, the content is merely for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model; however, the scope of patent protection of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. A system for measuring the settling stability of drilling fluid, characterized in that, include: The main control unit is used to generate temperature control information and pressure control information, and to obtain the downward resistance of the test rod; Temperature control device and pressure control device, wherein the temperature / pressure control device is used to provide a simulated temperature / pressure environment to the experimental drilling fluid based on temperature / pressure control information; The testing device includes a test cup for holding experimental drilling fluid and a test rod. The testing device is used to control the test rod to move downward to the target position at the bottom of the experimental drilling fluid and to collect the downward resistance of the test rod in real time.

2. The system according to claim 1, characterized in that, The temperature control information includes the target experimental temperature and the duration of temperature holding, wherein the temperature control device includes: A heating jacket with a recessed groove at its top for accommodating the test cup; A first temperature controller is connected to the heating jacket; The second temperature controller is connected to the internal space of the test cup; Temperature control and measurement module, which is connected to two sets of temperature controllers.

3. The system according to claim 2, characterized in that, The testing apparatus includes: support; A test stand horizontally mounted on the support; The test rod has its top end fixedly connected to the bottom surface of the test platform and is set in a vertical direction; A pressure sensor, connected to the main control device, is used to measure the dynamic pressure at the top of the test rod; The test cup is positioned below the bottom of the test rod; A transmission unit is used to immerse the bottom of the test rod into the experimental drilling fluid or to pull the measuring rod out of the experimental drilling fluid by controlling the lifting and lowering of the test platform.

4. The system according to claim 3, characterized in that, The testing apparatus also includes: A conduction chamber is disposed on the top surface of the heating jacket and covers the mouth of the test cup. A pressure balancing chamber is constructed in the middle of the conduction chamber, and the test rod passes through the pressure balancing chamber.

5. The system according to claim 4, characterized in that, The side wall of the conduction chamber is provided with a lateral through hole, which is used to connect the pressure balancing chamber with the external space.

6. The system according to claim 4, characterized in that, Multi-level sealing rings are constructed at different positions along the axial direction of the conduction chamber to ensure the isolation of the pressure balance chamber from the external space and the experimental drilling fluid.

7. The system according to claim 5, characterized in that, The pressure control device includes: A pressurizing device, which is connected to the lateral through hole, is used to pressurize the pressure balance chamber; A pressure control and measurement module, which is connected to the pressurizing equipment.

8. The system according to any one of claims 3 to 6, characterized in that, The support frame has an L-shaped structure, wherein the transmission unit is located inside the vertical frame, the test bench is connected to the side wall of the vertical frame via a track set along the vertical frame, and the heating sleeve is set on the horizontal frame.

9. The system according to any one of claims 3 to 6, characterized in that, The test rod is made of plexiglass.

10. The system according to any one of claims 3 to 6, characterized in that, The transmission unit includes: The motor and its control unit assembly are used to respond to test commands or reset commands issued by the main control device; Slide rail; A ball screw is mounted on a slide rail, wherein the ball screw is connected to the output shaft of the motor; A slider is disposed on the slide rail, wherein the slider is fixedly connected to the test platform.

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